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draw operations. Direct3D 10 requires that you specify this offset in
bytes and not in elements that depends on the format.
The last set method is IASetVertexBuffers. It allows you to set one or
more buffers with one call. As you can use up to 16 buffers at the same
time you have to specify a start slot and the number of buffers you want
to set. Then you have to provide a pointer to an array of buffer object
interface pointer which the right number. Even if you want to set only
one buffer you have to pass a pointer to the pointer of this single buffer.
In comparison to the index buffer you don't need to provide any format
information here. They are already store in the input layout. But you still
need to provide the size of every vertex and the offset to the first vertex.
As the vertex buffers are type less Direct3D 10 assume that they store
bytes for both information's.
Every one of these four methods has a partner that allows you to get the
current configuration of the input assembler. Instead of the Set their
names contains a Get.
Vertex Shader
The vertex shader is the first programmable stage in the pipeline. It is
base on the same common shader core as the other shaders. It can take up
to 16 input register values from the input assembler to produce 16 output
register values for the next pipeline stage. As the common shader core
defines two more data sources you could not only set the shader object
with VSSetShader. VSSetConstantBuffers will let you set one or more
buffers that contain the constant values for the shader execution. To
provide the other shader resources like textures VSSetShaderResources is
used. Finally VSSetSampler let you set the sampler state objects that
defines how read operations on the shader resources have to be done. All
three methods take a start slot and the number of elements you want to
change. Follow be a pointer to the first element of an array with the right
number of elements of the necessary type. Again there is a Get method for
every Set method.
Geometry Shader
The second shader unit is placed behind the vertex shader. Instead of
taking a single vertex it gets the vertex data for a whole primitive.
Depending on the selected primitive type this could be up to six full data
sets. On the output side every geometry shader invocation generates a
variable number of new vertices that can form multiple primitive strides.
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